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Re:Study HN: Linear Algebra 1, fortnight 2 by gruseom on Wednesday October 19, 2011 @02:07PM (#3131306)
Oh, absolutely. The exercise is to construct one example.

If you were talking about solving the general case (For any C, find D such that CD = -DC) I can see why you wanted more powerful tools.

Re:Study HN: Linear Algebra 1, fortnight 2 by impendia on Wednesday October 19, 2011 @03:26PM (#3131641)
oh! that's easier :)